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对有污灌17年历史的土壤中Cd、Cr、Pb、Hg、As等五种元素进行分析和研究,结果表明:Cd在污灌土壤中无任何累积现象;Pb、Hg、As有一定累积,但未达显著程度;Cr在土壤中有明显累积,其污染原因是用工业废水污壤。用含Cr较高的井水灌溉,也是Cr污染原因之一。污灌后土壤Cr和Pb在上层比下层高,达显著水准。Hg、As分布亦有类似规律,但未达显著水准。只有Cd的含量下层略高于表层。清灌对照土壤上下层Cr的含量,上层明显高于下层,说明对照区土壤上层原来就轻度的铬染。
Five elements of Cd, Cr, Pb, Hg, As and other five elements in soils with sewage irrigation for 17 years were analyzed and studied. The results showed that there was no accumulation of Cd in sewage irrigation soil; Pb, Hg and As had a certain accumulation , But it did not reach a significant level. Cr had obvious accumulation in the soil, the reason of which was pollution with industrial waste soil. Irrigation with high-Cr containing well water is also one of the causes of Cr pollution. Sewage irrigation soil Cr and Pb in the upper than the lower, reaching a significant level. Hg, As distribution also have similar rules, but not reached the significant level. Only the content of Cd is slightly lower than the surface layer. The contents of Cr in the upper and lower layers of soil were compared with those in the control. The upper layer was obviously higher than the lower layer, indicating that the upper layer of the soil in the control area was slightly chrome dyed.